Xanax is the brand name of the drug Alprazolam and belongs to a class of benzodiazepines, which work as a central nervous system (CNS) depressant. This means that the drug is prescribed to treat anxiety and panic disorders. It works by depressing a neurotransmitter called GABA (gamma-aminobutyric acid) and helps a person feel calm. Even though the drug is prescribed to treat anxiety and panic disorders, it is suggested that the drug should be taken only when the situation causing anxiety or making a person feel panic goes out of control.
Now we would like to introduce the different kinds of Xanax bars:-
Each Xanax bar comes with its own special features, and the color of each Xanax bar or pill depends on the manufacturer of the drug. Now you might be thinking about why we are trying to relate yellow Xanax bars with R039; then our answer is straight forward.This is so because each Xanax bar has something different that differentiates it from the other Xanax bars. The same can be said for yellow Xanax bars (R 0 3 9), which is actually the number imprinted on the yellow Xanax bar and is usually identified as the pill filled with the drug in the quantity of 2mg. However, there can be hazardous results of buying the Xanax yellow bar R039 from the street because the drug's price might vary according to the vendor selling the drug.
Yellow Xanax vs. White Xanax
Yellow Xanax tablet or “bar” comes with an imprint that indicates R 0 3 9 to differentiate the drug from other pills. Because of its similar look to Xanax, save its color, people refer to this bar as yellow Xanax, which is easier to remember than yellow alprazolam. Its shape and look resemble a school bus, so the slang term “yellow school bus” was coined.
Other available colors of alprazolam include the following:
White, oval – 0.25 mg
Peach, round – 0.5 mgOrange, oval – 0.5 mg
Blue, oval – 1 mg
Yellow, four-sided – 1 mgWhite, rectangle – 2 mg
Green, three-sided – 3 mg 
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